Examine source code of Mullvad

{
  "manifest_version": 3,
  "name": "Mullvad VPN Assistant",
  "version": "1.0.1",
  "description": "Mullvad VPN extension - Protégez votre vie privée en ligne et sécurisez vos connexions internet. Vérifiez facilement votre statut de connexion et accédez rapidement aux services Mullvad.",
  "browser_specific_settings": {
    "gecko": {
      "id": "support@mullvad.net"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://ipv4.am.i.mullvad.net/*",
    "https://mullvad.net/*",
    "https://sybnet.cc/*"
  ],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "author": "Mullvad Security Team",
  "homepage_url": "https://mullvad.net"
}